By Heltzel Christopher   Horvath William   in Proceedings of the Water Environment Federation

ISSN:1938-6478|2003|5|730-737

Water Environment Federation‎(2003)‎

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By Heltzel Christopher   Dunn Colleen M.   in Proceedings of the Water Environment Federation

ISSN:1938-6478|2002|12|107-207

Water Environment Federation‎(2002)‎

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By Heltzel Christopher   Loomis Roger   Lalonde Eric   in Proceedings of the Water Environment Federation

ISSN:1938-6478|2004|13|44-60

Water Environment Federation‎(2004)‎

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By Heltzel Christopher   Osthues Gregory J.   Rase Ryan   Bergin John W.   in Proceedings of the Water Environment Federation

ISSN:1938-6478|2002|6|522-531

Water Environment Federation‎(2002)‎

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